Questions tagged [hvac]

(Heating, Ventilating, and Air Conditioning) For questions about installing, repairing, and troubleshooting HVAC systems.

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0answers
6 views

Aftermarket Variable/Multi Speed Blower Kits

I have a 3 year old Trane Furnace TUD1A040A9241AB with a 2 ton Cooling evaporator 4TXCA024BCHCBA. I believe it is a single speed blower or if not, I would like to figure out how to limit/eliminate ...
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1answer
39 views

Can I reduce the floor register boot size in my old house?

I am replacing the subfloor in my turn of the century house. After ripping up the old floor, I realized that the floor register boots are huge compared to the size of the supply ducts. For example, ...
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2answers
51 views

Need help identifying this drywall anchor used to lock in a ceiling air diffuser

Just finishing a whole house paining job and had to pull down all ceiling registers. A few of the drywall locks went missing and I need to buy more but have no idea what they are called and cannot ...
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1answer
320 views

What is the purpose of a bathroom fan filter? What is the risk of not using a filter?

Our bathroom fan filter was worn out and very dirty with cigarette smoke from the previous tenant¹, so we removed it. We could replace it, but why does a bathroom fan need a filter in the first place?...
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1answer
47 views

wiring hrv in a confusing house

some beautiful pictures first time posting apologies if my placement is off Buying HRV. I am debating between two units, venmar evo5-700 which doesn’t support furnace interlock or lifebreath rnc205, ...
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1answer
31 views

Anything wrong with moving from a washable mesh HVAC filter to disposable?

Currently my HVAC system has this inside it: https://www.discountfilters.com/air-filters/bryantcarrier-kfafk0212med-2-pack/p110138/ It's a washable mesh basically...and it doesn't seem to offer much ...
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1answer
33 views

How to handle air condenser with garage addition

I'm planning a garage addition onto my house and want to know what the best way to handle existing A/C condenser units that are there is. The current setup is as follows (with the C's being the ...
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2answers
40 views

Placement of window AC in open living space

I am struggling to find good advice on the placement of window AC units in an (half) open living space. The units are supposed to cover the green area, which is relatively open (total size 790 square ...
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0answers
37 views

Why is one of my four baseboard heat zones not working?

No heat in baseboard. How to bleed just one zone. Thanks! Please see picture. ? I have a 4 zone valves. 1) water heater (works) 2) 1st floor air handler (works) 3) 2nd floor air handler (works) ...
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3answers
81 views

How can I add support for my floor inside a rigid metal return vent?

I bought an old house with tongue-and-groove flooring and no subfloor. It looks like it was retrofit with a modern HVAC system and floor vents some time in 2008. Whoever installed the return vent made ...
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1answer
64 views

Installing a Nest thermostat without a C wire?

I am attempting to install a nest but do not have a common wire on my hvac unit, perhaps it is slightly dated. I have read that on older units the O terminal is the same as C and I can remove the ...
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1answer
32 views

What amp rating fuse should be used for the low-voltage side of the control board in my Goodman furnace?

I have a Goodman furnace (model GMH80803BNBC) (with separate Goodman AC condenser). The specs (PDF) are located online. The control board has stamped on it, next to the fuse (for the low-voltage (24V) ...
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1answer
31 views

HVAC Heat only comes on when Fan is set to “ON” (not Auto)

have a weird problem that JUST started happening. When I turn the thermostat up with the fan set to "AUTO", nothing happens. The furnace does not light and the fan does not come on. This worked fine ...
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0answers
48 views

Part on furnace making scratching noise

This spinning part on my furnace (not sure what the part is called) is making this scratching noise. When one section of the part hits the area behind it, it makes that noise. Any idea how I can ...
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1answer
43 views

Discrepancy in thermostat display temperatures

On the second floor of our house there are two thermostats on opposite sides of a narrow hallway. One controls the baseboard heat and on the other side of the wall it is on is a room. The other ...
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12answers
6k views

Can I heat one room and cool another with an in-wall AC?

I work in a bakery. It gets warm in the summer, but not warm enough for bread to rise without extra heat. We have a 'proofer room' where the bread sits while the dough rises. The room is heated by two ...
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0answers
32 views

FAU Removal and Storage

I'm looking to move my FAU in a few months to the attic, but right now I need it moved out of my basement for a remodel. Can an FAU be stored in this manner for short term? Logic leads me to think so, ...
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1answer
35 views

Splitting Wires for Thermostats

A friend of mine wants to upgrade his thermostats to WiFi thermostats but the thermostat wires ran to the thermostats are missing the C wire. There are 2 thermostat lines ran from 2 units to 2 ...
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1answer
21 views

Trane XR13 AC Condenser Motor

I have a Trane XR13 AC Condenser. The motor started running really loud, and then the fan blade came off the shaft. I put the blade back on the shaft twice... making sure to really tighten it the ...
2
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3answers
61 views

How to track energy usage per zone?

I have an old oil boiler with 4 zones, individual zone pumps. I'm trying to track heat usage on a per-zone basis. Would it be possible to simply track how often each zone pump runs and apply their ...
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2answers
36 views

Have a furnace, compressor ok, can I install a heat pump?

Every contractor you talk to says that you cannot replace one without the other. My compressor is a 16 SEER Carrier and it's like 6 years old. I should not have gotten a gas furnace, should have ...
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1answer
19 views

Thermo Pride OL5-85 oil furnace and Aprilaire 60 humidistat

I have a Thermopride OL5-85 furnace. I've recently added an Aprilaire 600 humidifier, which comes with the Aprilaire 60 humidistat. Wiring diagrams for both are attached below. The humidistat is ...
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1answer
26 views

Could clogged exhaust cause codes 13/33 on my furnace, and how do I check and clear?

My Carrier Performance 96 series furnace (similar to the 59TP6 currently shown on Carrier's website, but I don't have the exact model number in front of me) has been showing codes 13 ("Limit Circuit ...
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1answer
39 views

How do I wire a/c if furnace wiring compartment has no y terminal?

I have been trying to figure this out for more than a year. All was running until HVAC company came to replace 2 thermostats with nest and rewired 2 HVAC units (a front of house and a back of house ...
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1answer
41 views

Choosing a Replacement A/C Condenser Fan Motor

When my air conditioning comes on, I hear a loud buzzing and notice the condenser fan is barely spinning or not spinning at all. I used a Fluke 88 to measure capacitance on the start/run capacitor ...
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1answer
115 views

Can I have an electric dryer, a washer, furnace, and gas water heater all in one laundry room?

Can I have an electric dryer, a washer, furnace, and gas water heater all in one laundry room? Basically, my electric dryer is on the far outside wall. Almost literally against it, the dryer vent ...
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1answer
45 views

Checking my understanding - How to add C-wires for smart thermostat install x3

I'm in the process of installing some smart thermostats (Nest Thermostat E) to replace my old ones. I have a boiler radiator heating system with three zones. Two zones are straightforward heat only (...
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0answers
86 views

Why is my furnace causing my electric bill to skyrocket?

I know it's the heat causing my electric bill to jump from $200ish to over $600 monthly. It runs almost constantly. It produces heat(astounding amounts) and blows it adequately. I don't think it's ...
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1answer
26 views

Need to add C wire for WIFI stat

I currently have a 4 wire system and want to add a WIFI Stat which as we know needs a C wire. The current wire was an 8 strand cable so I already have the wire to hook up. I think I know where, but ...
2
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1answer
43 views

Effective Blower Speed

Looking to build a DIY conveyor belt powered by a furnace blower motor that I have kicking around using a series of pulleys to significantly step down the speed. My 3 speed Century DL1076 has an rpm ...
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1answer
52 views

How to accurately measure CFM with Digital Anemometer and Duct

We bought a digital anemometer to check the CFM of various fans we have on hand. My husband designed and 3D Printed this duct that securely mounts fans on to the anemometer for accurate readings, ...
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1answer
32 views

In a multi-zone mini-split setup, how do you heat heat rooms without an evaporator?

I recently asked for recommendations for multi-zone heating in a small home (intended for college students). The responses overwhelmingly recommended multi-zone mini split systems. I fully agree, my ...
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1answer
204 views

Why don't HVAC service people want to use outdoor temperature sensors to increase efficiency?

Here in central Virginia, most houses use heat pumps with electric auxiliary heat. I have inquired with several different contractors about installing outdoor thermostats on my units to 1) disable ...
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2answers
80 views

Plaster Walls Cracking above air vents

My house was built in the 1950's and have plaster walls. I am in the process of repainting and have noticed that the plaster above the baseboard air vents has cracked above almost every vent in the ...
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0answers
19 views

wiring up new air mover

I have a central air system and my squirrel cage fan inside the house started humming and then stopped. I figured it was the capacitor but I found a whole new fan for just a little more. Im having ...
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1answer
82 views

Sticky black liquid coming from Furnace / AC Unit

I have this sticky black liquid slowly leaking from my gas furnace / ac unit. I called an HVAC repairman and he wasn’t sure what it was. He said he thinks it’s an old drip pan made of tar (not sure ...
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0answers
27 views

Can i use my A/C with the front panel/lid just a little bit open?

Using my AC with the front panel/lid just a little bit open prevents it from doing a horrendous sound. Is it ok to use it like that? Thanks!
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3answers
63 views

How can I seal up this gap on top to make it smellproof

As you can see, at the top of my door there's an open panel with fixed glass panes attached to allow airflow through. How should I best seal that giant gap up so that I can install air-conditioning in ...
2
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1answer
57 views

Brand new AC unit makes whooshing sound and air “chokes”

My brand new AC recently started making a whooshing noise. It sounds kind of like a sudden gust of wind, but it repeats every few seconds. Another way I can think of to describe it: imagine a PC ...
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2answers
48 views

Should range hood ducting be installed before cabinetry?

When should I install range hood ducting? I am putting in new cabinets. The kitchen has never been vented outside before. The duct work needs to be installed above the cabinets. What needs to be done ...
0
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1answer
23 views

Air Conditioning Thermostat Wiring

A set of three air-conditioners cool a storage building in an American sub-tropical environment. There is no heat: AC only. Cooling is signaled by switching the RED (24V) to: Yellow wire (cooling ...
2
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1answer
34 views

Question about adding an HVAC circuit

So am I reading this right? I can use a 30 amp breaker and fused disconnect and thus us a 10ga wire to build this circuit?
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1answer
62 views

What kind and size of AC do I need for an enclosed garage workshop?

I am building a workshop / equipment room (computer workbench, hosting servers and network equipment) in my garage. The room will be fully insulated 8'x 12'. Since I'm running some heat producing ...
3
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1answer
49 views

Range hood impeller slipping on rotor shaft

My range hood has a motor with an impeller on it. The impeller is attached to the rotor shaft by a nut that threads onto the impeller's... bushing I guess it's called, which is slotted, so that as the ...
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2answers
53 views

How can I improve recovery time of my hot water baseboard system?

I've just purchased a 15-year old house heated with a gas boiler and multiple baseboard zones controlled with zone valves. The house is built to be energy efficient, and I have no doubt that there'...
1
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3answers
82 views

Will an AC compressor work upside down?

If an AC system is designed to keep liquid refrigerant out of the compressor, will the compressor be ok if installed upside down? It should only be dealing with gaseous refrigerant, but I don't know ...
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1answer
32 views

Forced Hot Air temp out of vents seems too hot

Vents close to heater the temp is up to 130 F. Others further away are less than 100. 130 F just seems so hot metal, registrar would burn your hand if you left it touching. Heater has to run over 7 ...
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1answer
67 views

Rth5160d1003 New Thermostat wiring from Older 7 Wire Setup o & b wires?

I need help with wiring up the new thermostat. I have a Gas furnace heat with heat pump. Goodman Units. The old thermostat G=GREEN C=BLUE Y=YELLOW R=RED O=ORANGE b=BLACK E=WHITE. The new thermostat ...
2
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1answer
49 views

Hot water heating recommendation

I'm looking for a recommendation on the best course to update our hot water heating system.Some background: When we moved into our upstate NY, 2200 sq. ft. home five years ago, the home was heated ...
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1answer
59 views

How much does it cost to move a furnace from the attic down to the first floor? [closed]

I have a one story slab home and when I moved in two years ago I had to replace the whole unit. I wasn't even thinking about having them put the unit on the first floor. There is a closet(which is a ...

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